import React, { Component } from 'react'
import PropTypes from 'prop-types'
import {nanoid} from "nanoid"
import './index.css'

export default class Header extends Component {
  // 对接收的props进行，类型，必要性的限制
  static propsTypes = {
    addTodo: PropTypes.func.isRequired
  }

  handleKeyUp = (event)=>{
    const {keyCode, target} = event
    if(keyCode !== 13) return
    if(target.value === ''){
      alert("输入内容不能为空")
      return
    }
    const todoObj = {
      id: nanoid(),
      name: target.value,
      done: false
    }
    this.props.addTodo(todoObj)
    target.value =  ''
  }
  render() {
    return (
      <div className="todo-header">
        <input type="text" onKeyUp={this.handleKeyUp} placeholder="请输入你的任务名称，按回车键确认"/>
      </div>
    )
  }
}
